Boot into Linux.
Linux Journal's Jan 2014 Issue listed these tools in their "Best Monitoring Applications":
This blog also lists quite a few free tools:
http://www.gfi.com/blog/the-top-20-free-network-monitoring-and-analysis-tools-for-sys-admins/
Many of the packages listed above are quite big and may be difficult to install and configure.
But, here are some very good and powerful command-line tools. These should be easy to download and install.
In groups of 2 (at most), download and install one of these packages. Write up a paragraph description of what the tool does and how it could be used to detect network problems or monitor network behavior.